Furnace-wall.



3 Sheets-@Smet l,

Patented Feb. I9, I90I.

P. L. cnowE. FunnAcE wALL.

(Application led Aug. 29. 1900i (No Model.)

m: Nonms :Evans co, PHora-uuu.. wAsmNaToN. o4 c.

Patented Feb. I9, |90I. P. L. CROWE.

FU HNACE WALL. (Application filed Aug'. 29. 1900.

(No Model.) s sheets-sheet 2.

n.: Nonms siens co., PHoToLlTuo.. WASHINGTON. n c.

Patented Feb. I9, I90I. P. L. CROWE.

FUBNAGE WALL. (Applictiun mea Aug. 29. 1900. (No Model.)

3 Sheets-Sheet 3.

i@ me/wm THE Nonms PETERS w. nam-nwo.. WASHINGTON. u, c.

vernuft @erica PAUL L. OROWE, OF DULUTH, MINNESOTA.

FU RNACE-WALL.

SPECIFICATION forming' part of Letters Patent No. 668,498, dated February 19, 1901. Application filed August 29, 1900. Serial No. 28AM. (No model.)

T0 all whom, t may concern/.-

Beit known that l, PAUL L. CROWE, a citizen of the United States, residing at Duluth, in the county of St. Louis and State of Min-A nesota7 have invented certain new and useful Improvements in FurnaceWalls; and I do hereby declare the following to be a full, clear, and exact description of the invention, such will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in furnaces, and more particularly to the construction of the walls of such furnaces; and it has for its object the construction of furnace-walls particularly adapted to inclose traveling grates and to embody draft-fines and water-boxes for the utilization of otherwise-wasted heat and the prevention of clin kers at the sides of the grate, and, further, for the protection of the metallic furnace-front and fuel-port.

It consists of a furnace-closure comprising overhanging side walls and overhanging bridge-Walls, the overhanging portions of the inner faces of said walls adjoining the grate and the bridge-wall over-hanging the end of the grate, the overhanging portion of the side walls, however, not overhanging the grate, but closely adjoining the sides of the grateframe and extending from the front of the furnace as far back as the bridge-wall.

It also consists in a furnace provided with suitable walls adapted to inclose an adjustable grate, of water-boxes arranged upon the inner surfaces of the said Walls, so as to prevent the format-ion of clinkers, water-boxes also arranged in the front and rear of the grate-frame to protect t-he furnace-front and the bridge-wall from the effects of excessive heat, the said furnace-walls being also provided with draft-fines for introducing sufficient air to the combustion-chamber to obtain practically a perfect combustion of the fuel.

It also consists in certain other novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed. i

In the accompanying drawings, Figure l represents a longitudinal vertical section through a furnace provided with walls constructed in accordance with the present invention. Fig. 2 represents a transverse vertical section through the same, taken upon a line passing through the bridge-wall. Fig. 3 represents a horizontal transverse section through the walls of the furnace, a portion of the arches at the front and rear of the furnace being shown in elevation and parts of the said arches being broken away. Fig. 4 is a detail sectional view showing a slightly different way of constructing the bridge-wall employed in such a furnace. Fig. 5 represents a partition-wall which is employed when a series of furnaces are arranged to form a battery. Fig. 6 represents a longitudinal vertical section through a furnace, the walls of which are adapted to support a tubular boiler.

In constructing a furnace with which I desire to supply improved means for protecting the walls and supplying air to the combustion-chamber I usually form the same with side and back walls made of brick, while the front of the furnace is preferably closed by a front plate, preferably of metal, but which may be made of brick or part brick and part metal. As seen in the drawings, such a furnacemay be formed of side walls 1 l and a rear wall 2, the outer portions of which are .built of ordinary brick, while the inner surfaces of the same are preferably provided with're-brick adapted to withstand the effects of high degrees of heat. In the front the side Walls l l are connected by a front plate 3, which is formed with a suitable aperture to accommodate the forward end of a grate-frame 4, which projects through the said opening. In adapting the walls of the furnace to a grate which is adjustable and not connected with the Walls thereof, a space is arranged between the grate-frame and the said Walls, as at 5 5. The upper parts of these spaces on each side of the grate are reduced and almost closed by forming overhanging portions 6 6 in the side walls. In the overhanging portions of each of the side walls I incorporate a Water box or tube 7, having one face flush with the inner face of the wall and exposed to the combustion-cham ber of the furnace. Said water-boxes preferably continue backward in the furnace-Wall and penetrate the rear'wall 2 of the said furnace-Wall. At their forward ends they project through the front plate or wall of the furnace. The ends IOO of these water-boxes are provided with suitable hand-holes, which are closed in any suitable manner, as at 8 S, so that easy access may be had to the water-tubes for cleaning or otherwise operating upon the same. These side-wall boxes 7 7 may be horizontal or laid at an incline, and the overhanging portions 6 6 ofthe side walls may be made correspondingly horizontal or may be laid at an incline in accordance with the arrangement of the water-boxes. The side-wall water-boxes extend from a plane slightly below the lower level ofthe upper face of the grate to a plane slightly above the highest level of the upper face of the grate and are primarily designed to prevent the formation of elinkers along the side walls adjacent to the grates. The bridge-wall 9 of the furnace, which is arranged transversely between the side walls 1 1 at the rear of the grate-frame, is also preferably protected at its edge by means of a water-box, as 10. The bridge-wall water-box lies upon and across the side-wall boxes 7 7 and has one face exposed to the combustion -chambe1. It may form the lower edge of the overhanging portion of the bridgewall or its upper face may be exposed and be arranged Hush with the top of the bridge-wall behind it, seen in Fig. 1 of the drawings. If desired, however, the upper face of the water-box 10 may be covered with brick, or a brick arch, as 11, may be arranged over the water-box forminga part of said bridge-wall, without departing in the least from the spirit of the present invention. rlhe latter construction is illustrated in Fig. 4 of the drawings, in which the bridge-wall is shown a little higher than the one illustrated in Fig. 1 of the drawings. rlhe formation of the bridgewall depends largely upon the construction of the boiler to be used in the furnace, it being necessary to arrange certain minor modifications to accommodate the general setting of various styles of boilers. The ends of the bridge wall box preferably penetrate the sidel walls 1 1 of the furnace and are likewise provided at their ends with hand-holes and suitable closures, as 12 12, for stopping the same. At the front of the furnace the combustion-chamber is also preferably lined by a water-box, as 13, the said water-box lying upon and across the side-wall boxes 7 7 and against the front wall of the furnace. It is especially designed to protect the metallic front and the edges of the fuel port or opening above the front end of the grate. The ends of the front box 13 also penetrate the side walls 1 l of the furnace, and it is provided at its ends with hand-holes and closures, as 14 14. Each of the water-boxes surrounding the com b ustion-ehamber is connected with the water-box adjoining it by suitable means-as, for instance, by means of expanded tubes-as seen at 15 in the drawings, so that the contents of the water-boxes may be passed freely from one box to the other. The said boxes may be connected with the boiler by any convenient construction, so that a circulation from the boiler may be passed through the same or the boxes may be provided with an inlet or outlet for wateror steam independent of the boiler. When the walls are used to support a boiler having cylindrical flues, the boiler being also cylindrical, I prefer to continue the front {ire-arch 1G forward over the said front water-box 13; but when mounting other styles of boilers the arrangement of the arch may be varied, as will be hereinafter more fully described.

In the construction of the walls of the furnace the overhanging portions 6 6 of the side walls are vertically pierced, as at 17 17, in a number of places along their length, the passages thus formed passing upwardly to points opposite the combustion chamber above the grate and being provided with laterally-opening passages, as 1S 1S, which direct air passing through thc passages 17 into the combustion-chamber. The entrance of these passages is preferably above the side waterboxes and may be at varying distances from the same, according to the height of the combustion-chamber at different points. The fl ues thus formed provide draft-passages from the space beneath the grate leading to the combustion-chamber, the air becoming heated in its passage through the furnace-walls. Other draft-lines may also be arranged in the side walls having vertical portions, as 17, and laterally-extending delivery end portions 17h, which open into the combustionchamber. The lower ends of the vertical portions 17 connect with longitudinally-arranged horizontal inlet-passages 17C, which extend to the front furnace. These passages are open at their front ends to receive air from outside the said furnace-walls. The air thus introduced will pass through these passages in the wall, becoming heated thereby and entering the combustion-chainber at a higher temperature for assisting in the combustion of the fuel.

The front wall of the furnace is preferably metallic and may, if desired, bearranged with a brick lining behind it, or it may be constructed entirely of brick, the said front wall 3 being preferably provided with a large central aperture or passage, as 19, for the passage of the front end of a grate and to form the fuel inlet or port above the said grate. The front arch 16 is arranged immediately above the grate at any suitable distance, extending to the rear for a short space and reaches from one side wall to the other. It is preferably formed of lire-brick, so as to withstand the effects of heat.

I sometimes arrange furnaces in series to form a battery, in which instance there is a longitudinal central wall, as seen in Fig. of the'drawings, which is formed upon each side with overhanging portions 20 20, the said overhanging portions having water-boxes 21 21, arranged with their inner faces exposed to the combustion-chambers upon cach side IOO IIO

of the said central wall. In such instances the inner ends, respectively, of the front and bridge wall boxes resting in the said central wall are preferably closed and may abut against each other. The portion of the furnace-Walls in the rear of the bridge-wall may be of any desired construction, but is substantially the same as the well-known construction of the walls of a common gas-combustion chamber in any stationary liue or tube boiler, except that the side water-boxes are continued along the inner face of the said side walls, being incorporated therein and piercing the rear wall of the furnace, or may, if desired, terminate under the overhanging portion of the bridge-wall. Said central wall is also preferably carried u p to the lower plane of the overlying boiler-tubes in the tubular boilers or so as to divide the boilers into flue-boilers, which central wall may also, if desired, be provided with air-passages substantially similar to those in the side walls.

In accommodating the wall and other protecting water-boxes to a water-tube boiler, for instance, such as is illustrated in Fig. 6 of the drawings, the arrangement of the parts is varied very little. In suoli an instance the side Water-boxes 22 extend from front to rear in the same manner as above described upon either side of the grate-frame 4; but instead of employing overhanging brick portions for supporting the said boxes they may rest upon metallic standards, as 23 23, if preferred, though overhanging portions may be employed in their place. The front and rear water-boxes 24 and 25, respectively, rest upon the side water-boxes, as before, and are exposed to the combustion-chamber upon their inner faces. The front water-box 24 may, if desired, form in some instances alower front header for the tube-boiler 26 and be connected with its circulation, though it will be apparent that it need not be connected with the said boiler if not desired, but an independent lower horizontal boiler-header may be superimposed upon said front water-box. In arching boilers of this character above the combustion-chamber I preferably construct the front arch 27 in a slightly different manner from that above described. As seen in Fig. 6 of the drawings, the said front arch is preferably doubled upon itself,the under portion 2S thereof extending forwardly again to a point inclose proximityto the front waterbox 24. The lower portion 28 of the said arch, however, does not touch the said box, but leaves a passageway between the two parts. The side air-dues of such a furnace preferably communicate with the space 29 thus formed between the upper and lower portions of this arch. The air entering this passage 29 is free to discharge itself through the passage 30 in the rear of the water-box 24 into the combustion-chamber near the front end of the grate.

As seen in Fig. 3 of the drawings, the arches may rest upon suitable metallic backs, as 3l 3l, which are preferably hollow to admit of the passage of air through the saine, the said backs upon opposite sides of the furnace being connected by tie-rods 32 32 for anchoring the ends of the said arches.

A furnace constructed with walls as above described is especially adapted for the use of grates which are mounted in frames adapted to be adjusted to different heights in the furnace. This is especially the case when traveling chain-grates are employed, the front ends of which project beyond the front wall of the furnace in order to receive their charges of fuel. The arrangement of the water-boxes around the combustion-chamber so as to line the walls of the furnace are well adapted for protecting the Asaid walls against excessive heat and for preventing the formation of clinkers.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is-

l. A furnace formed with side and end walls, the said side walls being formed with inwardly-projecting overhanging lportions adjoining the grate, water-boxes arrangedin the said walls and resting on the overhanging portions and having their inner surfaces exposed to the combustion-chamber, and transve rsely arranged water-boxes at the front and rear of thecoinbustion-chamber for protecting the bridgewall and the front wall of the furnace.

2. A furnace comprising side and rear walls and having a suitable front, inwardly-extending overhanging portions formed upon the inner faces of the side walls and arranged adjacent to the grate, longitudinally-arranged water-boxes above the overhanging portions in the said side walls having their inner faces exposed to the combustion-chamber, transversely-arranged front and rear water-boxes resting upon the side-wall water-boxes, the said front and rear boxes protecting the bridge-wall and the furnace-front from the heat of the combustionechamber, and means for gaining access to the interior of the said water-boxes, substantially as described.

3. A furnace comprising suitable walls, inwardly extending overhanging portions formed on the inner surface of the side walls adjacent to the furnace-grate, protecting water-boxes supported on the overhauging portions, the side walls being provided with airpassages extending upwardly behind the Water-boxes and adapted to discharge air into the combustion-chamber, end water-boxes arranged at the front and rear of the combustion-chamber so as to protect the furnace-front and the bridge-wall of the furnace from the heat-combustion chamber, substantially as described.

4. A furnace comprising suitable walls, water-boxes arranged upon the inner faces of theside walls, end water-boxes arranged transversely of the furnace and penetrating the side walls thereof, the said end Water- IOO IIO

IIS

boxes resting upon the side Water-boxes, means connecting the said Water-boxes ,where by a circulation of fluid may be accommodated through the said boxes, the said boxes extending entirely around the combustionchamber, substantially as described.

5. A furnace comprising side Walls, and end Walls, a front arch arranged above the furnace-grate, a bridge-Wall arranged at the rear of the same, Water-boxes lining the inner faces of the side walls, the front Wall and the bridge-wall of the furnace, the said WaterboXes penetrating the side and rear walls of the furnace, so that their ends are accessible, the said Water-boxes being provided at their ends with hand-holes, suitable covers for closing the said hand-holes, the structure being such that the Walls of the furnace will be protected at every point entirely around the combustion-chamber by the water-boxes from clinkers and excessive heat, and access may be had to the interior of the said boxes for cleaning them, substantially as described.

G. A furnace having side and end Walls, overhanging portions formed upon the inner faces of the side walls adjacent to the furnace-grate, air passage-Ways formed in the said overhanging portions of the side walls for conducting air from the space beneath the furnace-grate to the combustion-chamber, the said walls being also provided with passages extending into the same from the front and supplying air to vertical air-passages also arranged in the said side walls and adapted to discharge air above the grate in the combustion-chainber,the construction being such that sufficient air may be provided to produce a practically perfect combustion in the furnace.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

PAUL L. CRO WE.

Witnesses:

JAMES T. WATSON, WILLIE MoKAY. 

